Determining the value of a craft prior to purchase, sale or taking out fully comprehensive insurance. Determining the causes, consequences and origins of an accident, defect or failing. Overseeing construction from new or repair work. Detection of irregularities, tests, trials and analyses (oils, ultrasounds, hull sounding, osmosis etc.) Estimation of transformation or repair or total or partial refit costs for a craft or one of its constituant parts. Legal protection. Arbitration in case of litigation between parties. Advice, mediation and conciliation.